Arrangement for the transposition of a hollow cylindrical slide



Nov. 20, 1956 R. MOREILLON 2,771,239

ARRANGEMENT FOR THE TRANSPOSITION '7? A HOLLOW CYLINDRICAL. SLIDE 2 Sheets-Sheet 1 Filed May 15, 1952 INVENTOR. RaymazzJJVorez'ZZozz.

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Nov. 20, 1956 R. MOREILLON ARRANGEMENT FOR THE TRANSPOSITION OF A HOLLOW CYLINDRICAL SLIDE Filed May 15, 1952 United States Patent P ARRANGEMENT FOR THE TRANSPOSITION OF A HOLLOW CYLINDRICAL SLIDE Raymond Moreillon, Zurich, Switzerland, assignor to Ateliers de Construction Oerlikon, Zurich-Oerlikon, Switzerland, a corporation of Switzerland Application May 15, 1952, Serial No. 287,991 Claims priority, application Switzerland June 8, 1951 4 Claims. (Cl. 230-114) It is known that in a radial turbo-compressor the pumping limit can be shifted by means of a suction throttling process or that pumping can be entirely prevented. Said throttling may be accomplished, at least in one stage of the compressor by means of a hollow cylinder transposable in the axial direction by means of which the cross section of the intake for the medium may be reduced at least at the output at which pumping would occur.

The present invention concerns an arrangement for the shifting of such a hollow cylindrical shell in the intake channel of a radial wheel for the purpose of influencing the pumping limit of at least one stage of a turbo-compressor. In the present invention the slidable shell is designed as a movable frame transposable by means of a linkage system.

In the drawings, Fig. 1 shows diagrammatically in perspective a form of embodiment of the invention for one stage of a turbo-compressor with coordinate drive box and servomotor.

Fig. 2 is a cross-sectional elevational view, showing the turbo-compressor fluid impelling wheel, the fluid suction opening thereof, and the improvements of the invention with relation to said opening.

Fig. 3 is a cross-sectional transverse elevational view, taken on line A-A of Fig. 2.

The hollow cylindrical shell 1 forms a mobile frame with its two carriers 2 and the four riding wheels 4, which frame is guided in grooves of tracks 4a of the housing of the intake connection, as shown in Fig. 2, and can be transposed axially by means of a lobe 3 fixed at the bottom of the shell 1. The shell 1 is surrounded by a covering disc 7 of a hollow wheel 8 on the compressor shaft 9 with the required play.

In the throttling process the shell 1 is introduced into the range of the suction opening 8:: of the radial wheel 8 so as to decrease the cross section for the intake of the medium. The mechanism for affecting the movement of the shell 1 is herein shown for the actuation of three throttling shells 1 of a multistage compressor. It consists of a pressure controlled servomotor with a cylinder 10, a tension spring 11 and a piston 12 connected to a rack 13. In the gear case 14 there are three cam discs 15 on the cam shaft 16 which is driven by a gear wheel 17 by means of a rack 13. The roller 18 of the lever 19 rolls off on the cam disc 15 and determines the position of the shell 1 by means of a linkage comprsing a draw- 2,771,239 Patented Nov. 20, 1956 bar 20, the lever 21, the shaft 22, the lever 23 and the lobe 3. The bearings 24 are part of the compressor housing. The drawbar 20 is acted on by the tension spring 25 to cause the roller 18 to be pressed continuously on its cam.

Having thus described my invention, I claim:

1. A compressor having the combination of a rotatable hollow wheel for receiving and impelling fluid, a shaft for carrying and driving said wheel, said wheel having an opening surrounding said shaft for suction intake of said fluid, a cylindrical shell concentric with and surrounding said shaft and movable axially into and out of said opening for regulating the extent of said suction, said shell carrying a series of guide rollers, a housing for said wheel having tracks parallel to the axis of said shaft and shell for receiving and guiding said rollers, and means for moving said shell.

2. A compressor having the combination of a rotatable hollow wheel for receiving and impelling fluid, a shaft for carrying and driving said wheel, said wheel having an opening surrounding said shaft for suction intake of said fluid, a cylindrical shell concentric with and surrounding said shaft and movable axially into and out of said opening for regulating the extent of said,

suction, said shell carrying a series of guide rollers, a housing for said wheel having tracks parallel to the axis of said shaft and shell for receiving and guiding said rollers, a linkage mechanism including a cam follower for moving said shell, a disk cam pressing said follower, a spring drawing said linkage to exert counter pressure against said cam, and a shaft for rocking said cam.

3. In a radial flow centrifugal compressor, a rotor having an axial intake chamber, a shaft for said rotor, and means influencing the pumping limit of said compressor comprising a cylindrical shell in said intake chamber concentric with said shaft and movable axially to vary the cross-sectional area of said intake chamber, and a carriage supporting said shell and provided with guide rollers, said compressor including a housing provided with longitudinal guide channels Within which said rollers operate.

4. In a compressor, the elements defined in claim 3, in combination with a means for moving said shell, comprising a cam shaft, a cam thereon, a spring-pressed follower engaging said cam, and mechanism responsive to movements of said follower for shifting said shell axially.

References Cited in the file of this patent UNITED STATES PATENTS 1,110,864 Banner Sept. 15, 1914 1,556,771 Dupont Oct. 13, 1925 2,373,166 Chapman Apr. 10, 1945 2,490,188 Ziebolz Dec. 6, 1949 2,588,198 Bevington Mar. 4, 1952 FOREIGN PATENTS 215,476 Switzerland Sept. 16, 1941 339,720 Great Britain Dec. 18, 1930 606,328 Great Britain Aug. 11, 1948 

